Question
There are 56 yellow balls and 21 black balls in a basket. 37 of the yellow balls are defective. All the black balls are not defective. How many more yellow balls than black balls are not defective?
4 m

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There are 56 yellow balls and 21 black balls in a basket. 37 of the yellow balls are defective. All the black balls are not defective. How many more yellow balls than black balls are not defective?